DESCRIPTION

X509_STORE_CTX_cleanup() internally cleans up an X509_STORE_CTX structure.
The context can then be reused with an new call to X509_STORE_CTX_init().

X509_STORE_CTX_free() completely frees up ctx. After this call ctx
is no longer valid.

X509_STORE_CTX_init() sets up ctx for a subsequent verification operation.
It must be called before each call to X509_verify_cert(), i.e. a ctx is only
good for one call to X509_verify_cert(); if you want to verify a second
certificate with the same ctx then you must call X509_STORE_CTX_cleanup()
and then X509_STORE_CTX_init() again before the second call to
X509_verify_cert(). The trusted certificate store is set to store, the end
entity certificate to be verified is set to x509 and a set of additional
certificates (which will be untrusted but may be used to build the chain) in
chain. Any or all of the store, x509 and chain parameters can be
NULL.

X509_STORE_CTX_trusted_stack() sets the set of trusted certificates of ctx
to sk. This is an alternative way of specifying trusted certificates
instead of using an X509_STORE.

X509_STORE_CTX_set_cert() sets the certificate to be vertified in ctx to
x.

X509_STORE_CTX_set_chain() sets the additional certificate chain used by ctx
to sk.

X509_STORE_CTX_set0_crls() sets a set of CRLs to use to aid certificate
verification to sk. These CRLs will only be used if CRL verification is
enabled in the associated X509_VERIFY_PARAM structure. This might be
used where additional ``useful'' CRLs are supplied as part of a protocol,
for example in a PKCS#7 structure.

X509_VERIFY_PARAM *X509_STORE_CTX_get0_param() retrieves an intenal pointer
to the verification parameters associated with ctx.

X509_STORE_CTX_set0_param() sets the intenal verification parameter pointer
to param. After this call param should not be used.

X509_STORE_CTX_set_default() looks up and sets the default verification
method to name. This uses the function X509_VERIFY_PARAM_lookup() to
find an appropriate set of parameters from name.

NOTES

The certificates and CRLs in a store are used internally and should not
be freed up until after the associated X509_STORE_CTX is freed. Legacy
applications might implicitly use an X509_STORE_CTX like this: